等离子体接枝丙烯酸改性聚丙烯腈导电纳米纤维纱线的制备

为提高聚吡咯在聚丙烯腈纳米纤维纱线表面的粘附牢度,增加纳米纤维纱线表面的亲水性,采用常温常压等离子体技术对聚丙烯腈纳米纤维纱线表面进行丙烯酸接枝改性处理,再通过原位聚合法制备聚吡咯导电纳米纤维纱线;探讨了等离子体接枝改性的最佳处理次数和接枝时间,研究了吡咯单体浓度、氧化剂用量、掺杂剂浓度和反应时间等对聚丙烯腈纳米纤维纱线导电性的影响。结果表明:当等离子体处理功率为100 W,接枝时间为4 h,接枝2次时,聚丙烯腈纳米纤维纱线的吸水率由未处理时的227.21%提升至350.31%,纱线的质量增加率可达90%;在吡咯浓度为0.6 mol/L,三氯化铁浓度为0.8 mol/L,盐酸浓度为0.6 mol/L,0 ℃条件下反应4 h时,聚丙烯腈纳米纤维纱线的电导率提高到4.589 S/cm。

Preparation of polyacrylonitrile conductive nanofiber yarn grafted with acrylic acid using plasma technology

In order to improve the adhesion fastness of polypyrrole on the surface of polyacrylonitrile nanofiber yarn and improve the surface hydrophilicity of nanofiber yarn, the surface of polyacrylonitrile nanofiber yarn was grafted with acrylic acid by plasma technology at ambient temperature and pressure, and the conductive nanofiber yarn of polypyrrole was prepared by in-situ polymerization. The optimal treatment time and grafting time of plasma grafting modification were discussed, and the effects of pyrrole monomer concentration, oxidant dosage, dopant concentration and reaction time on the electrical conductivity of polyacrylonitrile nanofiber yarn were analyzed. The results show that when the plasma power is 100 W, the grafting time is 4 h, the water absorption rate is increased from 227.21% to 350.31%, and the mass increase rate of polypyrrole is up to 90%. With concentrations of pyrrole being 0.6 mol/L, ferric chloride 0.8 mol/L, hydrochloric acid 0.6 mol/L, and the reaction time is 0 ℃ for 4 h, the conductivity of polyacrylonitrile nanofiber yarn is increased to 4.589 S/cm.